Electric fuse igniter



Dec. 1s, 1923. 1,477,735

I M. P. WEINBACH ELECTRIC FUSE IGNITER Filed April 2l. 1920 Wl INESSE ventola Patented Dec. 18, 1923.

UNITED STATES PATENT OFFICE.

MENDEL P. WEINBACH, OF COLUMBIA, MISSOURI.

ELECTRIC FUSE IGNITER.

Application led April 21, 1920. Serial No. 375,546.

useful Improvements in Electric Fuse Igniters, of which the following is a specification.

For mining and fuses are generally used.

by means of generally lighted blasting operations, time These fuses are a flame,

which being unconfined, frequently causes damage and is therefore dangerous and objectionable.

The present invention provides a lighter which confines the ignition and enables the fuse to be positively lighted at all times and uiidei' all conditions and obviates flame.

The drawings illustrate a bodiinent of the invention.

referred emowever, it is to be understood that in adapting the same to meet different conditions,

various changes in thel form, proportion, and minor details of construction may .be resorted to without departing from the nature of the invention as claimed here Referring tached:-

inafter.

to the drawings hereto at- Fig. 1 is a sectional detail of an end portion of the igniter.

Fig. 2 is a central section of the handle portion of the igniter.

Fig. 3 is a sectional view of the end portion of the igniter with the grip means omitted showing the parts on a large scale. Fig. 4 is a horizontal section of the line 4-4 of Fig. 3.

Corresponding and like parts are referred to in the following description and indicated in the several views of the drawing by like reference characters.

The igniter comprises a member 1 which is formed with a centrall dis )osed o ening 25 2, which is enlarged at one end f. The handle or member 1 maybe ot a t a iiy form iii aterial.

and any A socket 4 as .indicated .suitable insulating 1s fitted within the outer end of the enlarged portion 3 of the opening and An insulated bottom of the therefrom and passes of the handle 1. A the socket and is electri the contact 5.

contact 5 socket 4 .is internally screw A wire the opening of the member.

threaded. is provided in the and a wire 6 leads through the opening wire 7 connects with cally insulated from 8 extends through The wires 7 and 8 are spaced apart as indicated at 9,

and are adapted to be electrically connected by means of a circuit closure 10, which is actuated by means of a push button 11 set in an opening formed in a side of the inembei 1, opposite the enlarged portion 3 of the central opening. The wires 6 and 8 connect with any source of electric supply, which may consist of a battery or other form of generator.

A plug 12 is adapted to make screw thread connection with the socket 4, and embodies a shell .13, which is screw threaded to match the screw threads of socket 4. A contact 14 is located centrally of the outer end of the plug 12 from which it is insulated as indicated at 14 and is adapted to make electrical connection with the contact 5 when the plug is screwed into the socket 4 to the limit of its movement. The shell 13 is adapted to make electrical connection with the socket 4. Two wires 15 and 16 have their ends connected with, respectively, the contact 14 and the shell 13, as shown niost clearly in Fig. 3. These wires extend along the sides of a rod 17, which may consist of any suitable insulating material. The rod 17 is connected at one end with the plug 12. An element resistance 18 connects the outer ends of the wires 15 and 1G and may consist of a short length of platinum wire or metal or alloy of any nature, which will become sufficiently heated on the passage of an electric current therethrough to effect the ignition of a fuse. This resistance 18 may be considered as the igniter proper, since it becomes red hot on the passage of the electric current therethrough, whereby it is enabled to light the fuse or other part to be ignited. A tube 19 incloses the rod 17, the wires 15 and 16 and the igniter 18, and projects a short distance beyond the igniter 1S. The tube 19 is electrically insulated from the wires 15 and 16. Suitable insulating material 20 is interposed bew tween the parts 17 and 19, and may cow sist of plaster of Paris or other binding material. The tube 19 is of such internal diameter as to readily receive. the fuse 21, which may be easily slipped into the outer end of the tube, when it is required to light the fuse. An element 22 is fitted upon the tube 19 exterior to the shell 13 and plug 12 and provides grip means carrying the igniter proper 18. The element 22 is grasped in the hand when screwing the plug 12 into. the socket 4 thereby connecting igniter 18 through ineinblr l to the source oiu electrical supply of current.

In practice the Wires 6 and 8 of the igniter are connected to a. battery or other source of electric supply. rlhe fuse to be ignited is inserted in the outer end oi the tube 19 until it coines in contact with the igniter 1S while the push button ll is nioved inward to close the circuit and the ignitei 18 becon'iing sufficiently heated, lights the iuse. it Will understood that there is no iian'ic and that the ignition is confined, therebyv obviating the dangers iiicident to an unconlined iian'ie When igniting fuses in inining and blasting operations.

Having fully described in;7 invention, what l claiin as new and desire to secure by Letters Patent is l. Ei :fuse igniter coinprising an elongated tube of the saine diameter throughoutits ent-ire length for receiving the end et the fuse, and an ignitei disposed Within the tube for igniting the fuse when brought in contact therewith, said igniff1 being spaced i'i'roin the tube below the oint oi Contact whereby a closed L fe is provided below the fuse for confining` the giition.

an elongated tube oi the saine diainetei throughout its entire length adapted to receive the end oll the fuse to be ignited, and an electric igniter disposed within the tnbe, for contact with the fuse, and means for insulating the igiiiter t'roin the tube, said ineans coacting With the end ci the itusc to provide a closed space for confining the ignition.

3. A. fuse lighter coinpring a handle ineinber having electric conductors disposed therein, one of which is provided with a gap, and with circuit closing ineans tor bridging the gap, and a soclct for a fuse 2. fuse igniter, comprising adapted to be coupled to said nieniber, and containing fuse ignition ineans in the bottoirL thereof adapted to niahe electric connection with the conductors oi the handle ineinber when coupled thereto, and insulating ineens in said socket providing' space around the ignition ineans and below the fuse for contining the ignition.

A fuse ig* ter, comprising a handle ineinber., conductors disjosed Within the nien'iber, one oif the conductors having a gap, a circuit closure for bridging thcl gap, a ping adapted to be coupled to the nieinber, elect' qc conductors supported by ineens ol the pli-g, und adapted to inale electric connection with the conductors et the nieniber when the plug is coupled thereto, a resistance connecting the conductors of the plug and constituting the igniter, and a protector tube carried b v the plug for holding the fuse, said tubo being spaced frein the igniter to provide a closed ign'ition-conining space below the tube.

5. i fuse lighter comprising a hancle ineinber and a fuse ineinber 35er detachable association `vith the handle ineinber, electric conductors disposed in the handle incinoer, one of which is 1 rovided With a gap, a sliding ineinber for bridging the gap, a slidcarried by the outer end of the handle and having the conductors connected thereto, a plug carried by the fuse receiving nien'ibei iter engagement in the socket, a conructor the fuse ineinber connected u'ith the als oie. the plug, and a resistance wire ed in the conductor Wire carried by isc receiving nieinber disposed adjacent to the outer end thereoi ln testinioiiv whereof' l anni iny signature in presence oi tivo Witnesses.

MENDEL l). WYENBACH. TWitnesses Devin Kress, dairies T. Caixa.

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